TM 9-1215 Ordnance Maintenance: Thompson Submachine Gun cal .45, M1928A1 1942-03-01
"This manual is published for the information and guidance of ordnance maintenance personnel. It contains detailed instructions for inspection, disassembly, assembly, maintenance, and repair of the Thompson submachine gun, cal.45. M1D28A1, supplementary to those in the Field mid Technical Manuals prepared for the using arm. Additional descriptive matter and illustrations are included to aid in providing a complete working knowledge of the materiel."
Digitized by AHEC (U.S. Army Heritage Collections) http://www.carlisle.army.mil/ahec/